The climate challenge is sprawling and extraordinarily complex. It is too much for any individual to hold all of it in their head. That knowledge void has become a major political obstacle to effective climate action (SDG 13) as we fill it in paralyzing ways, from denial to apocalyptic fear.     The best way to learn that we can curb climate change is to do it. So Global GoalsCast co-host Edie Lush sat down with John Sterman, professor of Management at MIT, to solve the climate crisis on his ClimateInteractiv model of the world’s climate and economy. Edie tried everything from energy efficient homes to a steep tax on carbon in a search for solutions that would hold global temperature increases under 2 degrees Celsius (3.6 Fahrenheit). How did she do? Listen to this special two-part episode of Global GoalsCast, timed to coincide with the United Nations Climate Summit and the global journalism effort to increase awareness of the climate challenge, #CoveringClimateNow.